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| year | consumption | change |
| 1980 | .48 | NA |
| 1981 | .35 | -26.82% |
| 1982 | .35 | -0.57% |
| 1983 | .39 | 11.14% |
| 1984 | .41 | 4.63% |
| 1985 | .40 | -0.98% |
| 1986 | .45 | 11.91% |
| 1987 | .54 | 19.51% |
| 1988 | .62 | 14.84% |
| 1989 | .70 | 12.44% |
| 1990 | .45 | -35.92% |
| 1991 | .22 | -51.57% |
| 1992 | .35 | 61.57% |
| 1993 | .48 | 36.10% |
| 1994 | .57 | 20.63% |
| 1995 | .59 | 3.32% |
| 1996 | .75 | 26.52% |
| 1997 | .80 | 6.54% |
| 1998 | .85 | 6.02% |
| 1999 | .86 | 1.77% |
| 2000 | .91 | 5.69% |
| 2001 | .88 | -2.97% |
| 2002 | .89 | 0.57% |
| 2003 | .96 | 8.11% |
| 2004 | 1.01 | 4.90% |
| 2005 | 1.15 | 13.90% |
| 2006 | 1.14 | -0.70% |
| 2007 | 1.16 | 2.02% |
| 2008 | 1.23 | 5.51% |
| 2009 | 1.21 | -0.98% |
| 2010 | 1.34 | 10.21% |
| 2011 | 1.50 | 11.96% |
| 2012 | 1.54 | 2.54% |
| 2013 | 1.59 | 3.45% |
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